2  * Copyright (c) 2000-2001 Christoph Hellwig.
12  * 2. The name of the author may not be used to endorse or promote products
15  * Alternatively, this software may be distributed under the terms of the
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
32  * Veritas filesystem driver - lookup and other directory related code.
49 #define VXFS_BLOCK_PER_PAGE(sbp)  ((PAGE_SIZE / (sbp)->s_blocksize))
67  * vxfs_find_entry - find a mathing directory entry for a dentry
74  *   cache entry @dp.  @ppp will be filled with the page the return
83 	u_long bsize = ip->i_sb->s_blocksize;  in vxfs_find_entry()
84 	const char *name = dp->d_name.name;  in vxfs_find_entry()
85 	int namelen = dp->d_name.len;  in vxfs_find_entry()
86 	loff_t limit = VXFS_DIRROUND(ip->i_size);  in vxfs_find_entry()
89 	struct vxfs_sb_info *sbi = VXFS_SBI(ip->i_sb);  in vxfs_find_entry()
96 		pp = vxfs_get_page(ip->i_mapping, pos >> PAGE_SHIFT);  in vxfs_find_entry()
102 			struct vxfs_direct *de;  in vxfs_find_entry()  local
104 			if ((pos & (bsize - 1)) < 4) {  in vxfs_find_entry()
113 			de = (struct vxfs_direct *)(kaddr + pg_ofs);  in vxfs_find_entry()
115 			if (!de->d_reclen) {  in vxfs_find_entry()
116 				pos += bsize - 1;  in vxfs_find_entry()
117 				pos &= ~(bsize - 1);  in vxfs_find_entry()
121 			pg_ofs += fs16_to_cpu(sbi, de->d_reclen);  in vxfs_find_entry()
122 			pos += fs16_to_cpu(sbi, de->d_reclen);  in vxfs_find_entry()
123 			if (!de->d_ino)  in vxfs_find_entry()
126 			if (namelen != fs16_to_cpu(sbi, de->d_namelen))  in vxfs_find_entry()
128 			if (!memcmp(name, de->d_name, namelen)) {  in vxfs_find_entry()
130 				de_exit = de;  in vxfs_find_entry()
144  * vxfs_inode_by_name - find inode number for dentry
158 	struct vxfs_direct		*de;  in vxfs_inode_by_name()  local
162 	de = vxfs_find_entry(dip, dp, &pp);  in vxfs_inode_by_name()
163 	if (de) {  in vxfs_inode_by_name()
164 		ino = fs32_to_cpu(VXFS_SBI(dip->i_sb), de->d_ino);  in vxfs_inode_by_name()
173  * vxfs_lookup - lookup pathname component
183  *   A NULL-pointer on success, else a negative error code encoded
192 	if (dp->d_name.len > VXFS_NAMELEN)  in vxfs_lookup()
193 		return ERR_PTR(-ENAMETOOLONG);  in vxfs_lookup()
197 		ip = vxfs_iget(dip->i_sb, ino);  in vxfs_lookup()
202  * vxfs_readdir - read a directory
218 	struct super_block	*sbp = ip->i_sb;  in vxfs_readdir()
219 	u_long			bsize = sbp->s_blocksize;  in vxfs_readdir()
223 	if (ctx->pos == 0) {  in vxfs_readdir()
226 		ctx->pos++;  in vxfs_readdir()
228 	if (ctx->pos == 1) {  in vxfs_readdir()
229 		if (!dir_emit(ctx, "..", 2, VXFS_INO(ip)->vii_dotdot, DT_DIR))  in vxfs_readdir()
231 		ctx->pos++;  in vxfs_readdir()
234 	limit = VXFS_DIRROUND(ip->i_size);  in vxfs_readdir()
235 	if (ctx->pos > limit)  in vxfs_readdir()
238 	pos = ctx->pos & ~3L;  in vxfs_readdir()
246 		pp = vxfs_get_page(ip->i_mapping, pos >> PAGE_SHIFT);  in vxfs_readdir()
248 			return -ENOMEM;  in vxfs_readdir()
253 			struct vxfs_direct *de;  in vxfs_readdir()  local
255 			if ((pos & (bsize - 1)) < 4) {  in vxfs_readdir()
264 			de = (struct vxfs_direct *)(kaddr + pg_ofs);  in vxfs_readdir()
266 			if (!de->d_reclen) {  in vxfs_readdir()
267 				pos += bsize - 1;  in vxfs_readdir()
268 				pos &= ~(bsize - 1);  in vxfs_readdir()
272 			pg_ofs += fs16_to_cpu(sbi, de->d_reclen);  in vxfs_readdir()
273 			pos += fs16_to_cpu(sbi, de->d_reclen);  in vxfs_readdir()
274 			if (!de->d_ino)  in vxfs_readdir()
277 			rc = dir_emit(ctx, de->d_name,  in vxfs_readdir()
278 					fs16_to_cpu(sbi, de->d_namelen),  in vxfs_readdir()
279 					fs32_to_cpu(sbi, de->d_ino),  in vxfs_readdir()
283 				pos -= fs16_to_cpu(sbi, de->d_reclen);  in vxfs_readdir()
292 	ctx->pos = pos | 2;  in vxfs_readdir()